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Corinthian Colleges Inc., the troubled Orange County for-profit college operator, announced Sunday that it will end operations and close its remaining schools, affecting more than 16,000 students in California and other states.

In the wake of state and federal investigations into its job-placement practices, Corinthian had already sold the majority of its schools to a nonprofit student loan servicer last fall. But the company had still been seeking a buyer for more than two dozen campuses in California and other western states.